Marin, 25, spent the 2013-14 campaign on loan at Spanish side Sevilla from the West London club, and La Viola confirmed on their Twitter account on Monday morning that the player had undergone a medical.

The versatile midfielder, who can play on either wing and also behind the strikers, was considered one of the most promising talents of German football -- on a par with the likes of Marco Reus, Thomas Muller and Mario Gotze -- in his years at Borussia Monchengladbach and Werder Bremen, consistently impressing with the latter between 2009 and 2012.

Following his 12 million-euro move to Stamford Bridge in 2012, a series of muscular injuries meant he struggled to make the grade in England, playing just six times before moving on loan to Sevilla last summer.

Marin's potential has seemingly attracted Vincenzo Montella, though, and on paper he has the international experience and technique that the Viola coach is looking for.

The move would give Montella offensive reinforcement given that Colombia international Juan Cuadrado has been repeatedly linked with a move away to either Manchester United or Barcelona.